GRAND RAPIDS, MI -- A motorcyclist is reportedly "unresponsive" after a crash on eastbound I-196 at U.S. 131.

The crash occurred at 10 p.m. Tuesday, Aug. 20. An ambulance transported the male motorcyclist to the hospital with "obvious arm fractures," and emergency rescuers said the man was "unresponsive," medical dispatch traffic indicated.

Ambulance personnel said the motorcyclist was not wearing a helmet.

Police on scene believe at least two other vehicles were involved in the crash.

Michigan State Police are handling the scene, a Grand Rapids police lieutenant said. The ramp at southbound U.S. 131 to eastbound I-196 is closed.

Angie Jackson covers public safety and breaking news for MLive/The Grand Rapids Press. Email her at ajackso3@mlive.com, and follow her on Twitter.